When there are fewer than 15 replies:
![](http://www.tfproject.org/tfp/images/style_tfp4/newfolder.gif)
- New posts
![](http://www.tfproject.org/tfp/images/style_tfp4/folder.gif)
- No new posts
When there are 15 or more replies:
![](http://www.tfproject.org/tfp/images/style_tfp4/newhotfolder.gif)
- New posts
![](http://www.tfproject.org/tfp/images/style_tfp4/hotfolder.gif)
- No new posts
![](http://www.tfproject.org/tfp/images/style_tfp4/lockfolder.gif)
- The thread is closed and cannot be posted to.
If there is a black dot on these images, it means that you posted to that thread.
Edit: Damn,
Hal beat me to that while I was gathering the links to the images.